Vettori and Sakib cannot be compared yet in terms of their careers. Vettori's taken nearly 300 test wickets, had dozens of match-winning performances and is very hard to scorer off. Sakib's only started playing two years back. But..they both arer the best spinners for theior sides, both can bat better than many batsmen in their sides and are both strong characters. If sakib continues to shine like he has last year, he will eclipse Vettori by the end of his career. I've always considered Vettori a top 5, maybe top 3, spinner in the world. Sakib hasn't performed at that kind of peak long enough as yet. But hey, he definitely has the potential.